Stator and gap winding motor using the same

Abstract

A so-called gap winding motor capable of preventing a rotation detector from being affected by noise generated by a stator coil connection portion and decreasing the size and cost is provided. The gap winding motor comprises a stator including a stator core, a plurality of stator coils arranged on an inner peripheral surface of the stator core, a ring-shaped coil connection board configured to connect the plurality of stator coils, and ring-shaped shield patterns provided at both surfaces of the ring-shaped coil connection board. The stator core, the coil connection board, and the shield patterns are encapsulated with resin, and a rotation detector mounting printed circuit board is arranged in a gap located at an inner side of the stator core.

1. A stator for a gap winding motor, comprising:
 a cylindrical stator core having an inner peripheral smooth surface; 
 a plurality of stator coils, which are air core concentrated winding coils, arranged on the inner peripheral smooth surface of the cylindrical stator core at regular intervals, fitting inside the cylindrical stator core; 
 a ring-shaped coil connection board configured to connect the plurality of stator coils; 
 ring-shaped shield patterns provided at both surfaces of the ring-shaped coil connection board; and 
 a rotation detector mounting printed circuit board arranged in a space formed by an inner cylindrical surface of the ring-shaped coil connection board. 
 
     
     
       2. The stator as recited in  claim 1 , wherein in cases where a plurality of the ring-shaped coil connection boards are laminated, each of the plurality of the ring-shaped coil connection boards is provided, at both its surfaces, with the ring-shaped shield patterns. 
     
     
       3. The stator as recited in  claim 1 , wherein the stator core, the stator coils, and the coil connection board are encapsulated with resin. 
     
     
       4. The stator as recited in  claim 1 , wherein the shield patterns are grounded. 
     
     
       5. The stator as recited in  claim 1 , wherein the coil connection board is arranged at either side of the stator core in a rotational shaft direction. 
     
     
       6. A gap winding motor, comprising:
 a stator as recited in  claim 1 ; and 
 a rotor provided with a plurality of permanent magnets on an external peripheral surface of the stator, the plurality of permanent magnets being disposed so as to face against the stator via a gap. 
 
     
     
       7. The gap winding motor as recited in  claim 6 , further comprising a rotation detector arranged in a gap located at an inner side of the ring-shaped coil connection board. 
     
     
       8. The gap winding motor as recited in  claim 1 , wherein the rotation detector mounting printed circuit board is arranged inside the stator. 
     
     
       9. The stator as recited in  claim 1 , wherein the rotation detector mounting printed circuit board is located between the cylindrical stator core and an outer surface of the ring-shaped coil connection board in an axial direction of the cylindrical stator core.